Some ads are targeted based on your browsing history but even then not in the way you think. We are running some retargeting ads at the moment as a trial. These work by remembering products on certain websites that you have looked at. Then when you visit us here you may be presented with either an ad for a better deal on what you have just been browsing or for similar items from that website. There's a little 'i' in the corner of these ads and if you click that you can find out more about how they work and even opt out of the retargeting altogether.

Incidentally, the new site has fewer ads displayed on each page. Premier users get to turn off all but two ads in the RH column and the sponsor positions.